01 -
Preheat oven to 375°F (190°C). Coat a standard muffin pan with non-stick cooking spray and set aside.
02 -
In a large mixing bowl or stand mixer, cream softened butter and granulated sugar together until smooth and well combined, about 2 minutes.
03 -
Add egg to the mixture, then blend in vanilla extract, milk, and Greek yogurt or sour cream until fully incorporated.
04 -
In a separate bowl, whisk together flour, baking powder, baking soda, ground cinnamon, and salt.
05 -
Add dry ingredients to the wet mixture, stirring gently just until combined. Do not overmix.
06 -
Divide batter evenly among the prepared muffin cups, filling each about two-thirds full. Bake for 15–20 minutes, or until a toothpick inserted in the center emerges clean or with a few moist crumbs.
07 -
Allow muffins to cool in the pan for 1–2 minutes, then transfer to a wire rack for further cooling.
08 -
While muffins bake, melt the butter for the topping. In a separate bowl, mix granulated sugar and cinnamon.
09 -
Brush the tops of warm muffins with melted butter using a pastry brush, then generously sprinkle or dip into the cinnamon-sugar mixture until coated.